Sclark 384 blog ab example

********* PEOPLE *************
Primary reviewer: @suntzu86 

Reviewers:

********* DESCRIPTION **************
Branch Name: sclark_384_blog_ab_example
Ticket(s)/Issue(s): Closes #384 

********* TESTING DONE *************
manually run
make test
make style-test
with
```
#: blah blah
#: foo bar
STATUS_QUO = blahblah
```
you can docstring constants. See ``moe/optimal_learning/python/python_version/expected_improvement.py`` for example